Electronic engine control apparatus having improved configuration for ensuring excellent engine startability
a control apparatus and electronic technology, applied in the direction of electric control, machines/engines, instruments, etc., can solve the problems of delay in engine start, difficulty in immediately starting the engine, delay in initiating engine control, etc., and achieve excellent engine startability
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first embodiment
[0058]FIG. 1 shows the overall configuration of an Electronic Control Unit (ECU) 1 according to the first embodiment of the invention. The ECU 1 is for controlling an engine of a motor vehicle.
[0059]As shown in FIG. 1, the ECU 1 is connected with other ECUs 2 and 3 via a communication line 11, so that it can share various information with the ECUs 2 and 3 and utilizes the information to control the engine. For example, the ECU 2 is for controlling transmission of the vehicle, and the ECU 3 is for controlling devices belonging to the body system of the vehicle, such as a power window and a door lock.
[0060]The ECU 1 includes a CPU 21, which governs operation of the ECU 1 and executes engine control software for controlling the engine, a flash memory 22 in which the engine control software is stored, a non-rewritable ROM 23, a power-backed up RAM 24 (abbreviated to P.B. RAM in FIG. 1) which is backed up in power and thus always supplied with power, and an EEPROM 25.
[0061]The flash memo...
second embodiment
[0099]This embodiment illustrates an ECU 1A which is identical in hardware to the ECU 1 according to the previous embodiment. Accordingly, only the differences in software therebetween will be described hereinafter.
[0100]In the ECU 1A, the CPU 21 performs the rewrite control process illustrated in FIG. 2 with step S130 being deleted. Consequently, there is no version information sent from the program rewrite tool 15 to the ECU 1A.
[0101]Further, in the ECU 1A, the CPU 21 performs, instead of the initialization control process illustrated in FIG. 3B, an initialization control process illustrated in FIG. 5.
[0102]First, at step S310 of FIG. 5, the CPU 21 retrieves from the flash memory 22 data that is included in a specific area of the engine control software, and determines a specific value to the engine control software by performing a predetermined computation on the retrieved data. More specifically, in the present embodiment, the CPU 21 determines the checksum on the retrieved data...
third embodiment
[0119]This embodiment illustrates an ECU 1B which has almost the same configuration as the ECU 1 according to the first embodiment. Accordingly, only the differences therebetween will be described hereinafter.
[0120]In the ECU 1B, the EEPROM 25 includes N (i.e., a plurality of) specific information storage areas. For the sake of simplifying explanation, it is assumed hereinafter that N=2.
[0121]Further, in the ECU 1B, the CPU 21 performs, instead of the initialization control process illustrated in FIG. 3B, an initialization control process illustrated in FIG. 6.
[0122]First, at step S410 of FIG. 6, the CPU 21 retrieves, from the flash memory 22, the version information (abbreviated to V.I. in FIG. 6) on the engine control software which is currently stored in the flash memory 22.
[0123]At step S420, the CPU 21 further retrieves, from each of the two specific information storage areas of the EEPROM 25, the version information on the engine control software through execution of which the...
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